Book Title: Transmission System in Automobile PDF Fundamentals, Selections, Design and Applications
Author(s): Harald Naunheimer, Bernd Bertsche, Joachim Ryborz, Wolfgang Novak
PDf Size: 68.5 MB
This Automatic Transmission System in Automobile PDF eBook gives a full knowledge of the latest methods and processes of car transmissions.
The transmission system is the set of components that have the purpose of getting the engine turn to the driving wheels. With this system, it is also possible to vary the transmission ratio between the crankshaft and the wheels. This relationship is varied depending on the circumstances of the moment (cargo transported and the layout of the road).
The crankshaft is one of the basic parts of a car’s engine. Through it you can convert the linear movement of the pistons into a rotary, which is something very important to develop the final wheel-based traction, in addition to receiving all the irregular impulses provided by the pistons, to then turn them into a rotation is already regular and balanced, unifying all the energy produced in each of the combustions cylinders.
The automatic transmission pdf system in automobile pdf helps you understand the basic and advanced concepts behind lates gear transmission technologies implemented in all kinds of vehicles. Automotive engineering pdf are available if you want to gain more information regarding gearbox technologies. If the transmission shaft rotates more slowly than the crankshaft, we will say that there has been a reduction or decrease and otherwise an addition or super-gear.
An automatic transmission system in automobile pdf about automatic gear transmission is a gearbox of automobiles or other vehicles that can handle by itself to change the gear ratio automatically as the vehicle moves, freeing the driver from the task of changing gears manually. Similar but larger devices are also used in diesel locomotives and public works machines, and in general when a very high torque has to be transmitted. Traditionally the gearboxes are not obtained with parallel gears, as in the manual changes, but with epicyclic gears(see Figure). By means of suitable hydraulic control devices, one or more of the components of said epicyclic trains, also known as planetary gears, is selectively immobilized.
The predominant type of automatic transmission is that which operates hydraulically, using a fluid coupling or torque converter and a set of planetary gears to provide torque multiplication.
The set of an automatic change consists of 4 main mechanical components:
Sectioned torque converter
The torque converter, which at the moment of starting the vehicle reduces the engine revolutions to the primary or inlet to the change, gaining in the same proportion of engine torque, to progressively equalize them as the vehicle goes on reaching a higher speed, until the torque of the motor and the primary are equal when the speeds are the same.
The set or “box” of hydraulic valves that select the different brakes and clutches, to change the speeds.
the hydraulic pump that supplies the pressure to activate the brakes and clutches, as well as for the converter.
Determination of the points of change:
The decision time to know when you go from one speed to another depends on 2 parameters:
The position of the accelerator pedal, that is to say, the engine load that the driver demands from the vehicle (uphill, flat, downhill, number of passengers or load).
The speed of the vehicle:
This will allow the automatic transmission system in automobile PDF to change to longer ratios later and at a higher engine speed when driving uphill compared to when driving downhill or flat.
In the past, the control of the brakes and clutches was exclusively hydraulic, through a series of hydraulic valves mechanically controlled from the accelerator pedal for the load parameter on one side, and centrifugally (transmission output) for the parameter of the speed of the vehicle. For years now, these signals have been electrically detected and processed electronically, with a computer or electronic control unit (TCM) activating the control valves, which are now electro-hydraulic.
Transmission System in Automobile PDF Content:
- Mediating the power stream in vehicles
- Selecting the Gear Ratios
- Vehicle transmission frameworks
- Essential outline standards
- Typical plans of automotive transmissions
- Layout and plan of critical parts, e.g. outfit moving systems, getting off components, pumps, retarders
- Transmission control units
- Product advancement process, Manufacturing innovation of vehicle transmissions, Reliability, and testing.